First off the 2 numbers after the A indicate the viewable dimension of the tube diagonaly in cm. In other words when the tube is lit, you measure the actual pictuure from say top lefy to bottom right corners in cm.
Now convert that to inches ny dividing by 2.54 = 31.5 inches.
Now comes the mischief... in the 80's TV marketing groups would measure the tube corner to corner to the outside of the glass. They would have taken your same tube and called it a 33" or perhaps even a 34".
In came the consumer protection group and said this was a no-no thet is why they went to measuring the viewable screen and calling it a 32V.
Anyway chaces are you cabinet is a little frogiving and would take a 32" TV. I say this because I have customers who call me and ask for a 31" or a 34" and we sell them our 32" CGA open frame monitor. Touch wood but we have never had a problem.
Good Luck
Rick Nieman
Rick@niemandisplays.com
www.niemandisplays.com